Hang gliding. It's good if you are in an area with some hills and consistent winds. There are maybe a dozen well-established launch sites around the U.S. Sadly, I broke down my glider around 2001 -- and did a post-mortem on it to discover it had a minor dent in it.

Recommendation -- don't stall the glider at heights between 10 and 25 feet from the ground. Also, avoid barbed wire fences.